Display screen or portion thereof with a graphical user interface



A portion of the disclosure of this patent document contains material to which a claim for copyright and/or trademark is made. The copyright and/or trademark owner has no objection to the reproduction of the patent document or the patent disclosure, as it appears in the U.S. Patent Office records, but reserves all other copyright and trademark rights whatsoever.

The FIGURE is a display screen or portion thereof with a graphical user interface showing the new design.

The broken lines illustrate an electronic device and form no part of the claimed design. The broken line illustrates a display screen and form no part of the claimed design. 

CLAIM The ornamental design for display screen or portion thereof with a graphical user interface, substantially as shown and described. 